Piston pump



Nov. 6, 1928.

R. J. FAIRCHILD PISTON PUMP Filed NOV. 19, 1925 2 Sheets-Sheet 1 Patented Nov. 6, 1928.

UNITED, STATES P ROLAND .r. FAIRCHILD, or KALAMAzoo, MICHIGAN, .assrenon LIFT COMPANY, OF ,KALAMAzoo, MICHIGAN;

ATENT, or rice.

TO NATIONAL W ATER rrs'ron PUMP.

Application filed November 19, 1925. Serial No. 70,056

This invention relates to an improvement in piston pumps particularly designed for use in supplying air in compression air tank water systems. v An object of the invention is to provide a very simple structure which will insure delivery of air along with the water to main tain the air supply in the compression tank. A further object is to provide an improved construction of valvein such combination, and a still further object is to provide an improved arrangement of pump valves in that relation, to insure its efliciency.

Objects pertaining to details and economics of construction and operation will definitely appear from the detailed description to follow.

l accomplish the objects of my invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing. forming a part of this application, in which Fig. 1 is an elevation View bodying the features of my driving means being omitted.

Fig. 2 is an enlarged detail elevation view taken from the right hand of Fig. 1, the pumpitself being sectioned on line 22 of Figs. 1, 3 and 4.

Fig. 3 is an enlarged detail sectional view taken on the angular broken line 3-43 of Figs. 2 and,4. s

Fig. 4 is an enlarged detail sectional view through the pump on the broken plane indicated by the line 44 of Figs. 2 and 5.

Fig. 5 is a detail sectional View taken on line 55 of Figs. 2 and 4.

Fig. 6 is an enlarged detail vertical sec tional view through the air intake valve mechanism taken on line 66 of Fig. 7

Fig. 7 is an enlarged detail transverse sectional view taken on line 7-7 of Figs. 1, 4 and 6.

Fig. 8 is an enlarged detail View from the right side of the spacer washer of Fig. 6 of the air intake valve mechanism.

In the drawing similar reference characters refer to similar parts throughout the several views,.and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

invention, the

of a pump em The parts of the drawings will be referred to by their numerals of reference. 1 is the supporting base, 2 the complete pump cylinder, 3 are the bolts attaching it to the base, 4 is the stufling box, 5 is the hydraulic pump piston, and 6 is the piston rod for the same, all of usual design, The pump is double acting. The head 7 screws into the cylinder, and has a gasket 8 of usual con struction. The head is extended into an axially centrally-disposed valve chamber 9, within whichis disposed a hydraulic 'cup pump packing constituting the valve.

The pump packing in held in screw 11 from the'inside. The valve cham her 9 has an axial externally screw-threaded extension 91 flattened at 92. 12 is adjustable thereon to vary the size of the passage. An internal screw thread 93 is provided for the screw 11, cut away at 110 to form an air passage therethrough, so that there is an air passage around the edge of the cap 12 through the opening. into the cap through the opening 110 into the valve chamber, thence past the yielding valvelO into. the cylinder. A spacer washer 111 with place by the The screw cap notched annular rib 111 is disposed on the i 1 screw 11 within the valve casing 9. These parts fit very closely and any air drawn in is at once stopped and forced on through the pump.

The pump connects to the suction pipe 14 and is provided with an air chamber 15. The intake manifold 13 connects with the suction pipe'14. The valve casings l6are slightly inclined and the valves 17 are in slightly inclined relation from the vertical on their seats and are held in place by springs 18, so that a very slight opening permits the water to deliver up quickly into the cylinder. The usual valves 20 are provided on the discharge side of the pump, delivering the waterto the delivery pipe 21. The-air is preferably delivered through the air pipe 22 to the air chamber of thetank.

I desireto state that my improved air valve structure can be used with various kinds of water pumps, but the pump structure here shown is especially adapted to that end. I therefore desireto claim the structure specifically as here illustrated, and also the H11 intake combination broadly, as pointed out in the appended claims. 7

c Having thus described my invention, what I claim as new and desire to secure by Letsize of the aperture therethrough, as de' ters Patent is: scribed. I

1. An air valve for a hydraulic pump com- 2. An air valve for a hydraulic pump comprising a cylindrical casing, a hydraulic prising a cylindrical casing, a hydraulic 15 I packing Within said cylinder constituting packing within said cylinder constituting the the valve, an extension to the said casing; valve and a screw flattened on one side for screw threaded outsideand inside and flatretaining said hydraulic packing valve in tened on one sideya screw flattened onone position, as described.

side for retaining said hydraulic packing In witness whereof I have hereunto set my 20 10 valve in position, and a screw cap over said hand.

screw threaded extension for adjusting the ROLAND J. FAIRCHILD. 

